This is Nerka's double monitor system. This will allow you to hold 2 units up to 15". The Patented skeleton bracket will allow you to slide your monitor left or right giving you maximum adjustment! Features:
2 - 7" mounting plates with slide brackets w/hardware
I run two Humminbird Helix units in the bow of my 21 foot Lund. One 10 and one 12. They are ont he Nerka Coho mount and they DO NOT MOVE. The mount was easy to install and gave me more flexibility for positioning than I needed. Glad I used the NERKA.